DaeKyoung Kang

Massachusetts Institute of Technology, Cambridge, MA

Cold atoms from few-body physics: Application of Pionless EFT

Cold atoms are one of example systems interacting
through a large scattering length that can be studied by using so called
Pionless EFT. They display therefore similar
features to nuclear systems but are more easily accessible and
controllable in experiments. However, theoretical understanding of this
system
is challenged by nonperturbative nature of the interaction. Having
analytic relations
valid for various states of the system are therefore very valuable.
In this talk I would like to discuss those relations and show that the
Operator
Product Expansion technique is a powerful tool to derive
those relations. I also discuss recently measured unitary Bose gas
that shows an excellent agreement with prediction by the relation.